青海西宁-乐都富硒土壤成因探讨（增刊）

本文通过对青海西宁-乐都土壤硒空间分布特点的分析,结合不同地质单元和成土母质的硒含量的特点,以及对硒的沉积环境和物质来源的讨论,确定了第三纪西宁群为富硒土壤的直接来源,拉脊山高硒火山岩为硒的富集提供了物质基础。提出了西宁-乐都富硒区富硒土壤的成因类型。即拉脊山高硒火山岩在咸水湖退缩阶段,经过复杂的迁移过程,富集于第三纪西宁群祁家川组等地层,最终在这些地层上发育成壤,形成可供开发利用的富硒土壤。

The discussion of the genetic type of selenium-rich area in Xining-Ledu

According to the characteristics of spatial distribution of the selenium in soil in Xining-Ledu ,Qinghai.Combining with the content of selenium in different kind of geological unit and soil parent material, the discussion of sedimentary environment and material source of selenium.It is sure that Xining group of the Tertiary is the direct source of selenium in soil.And Mountain Laji provides a material basis for the concentration of selenium.In addition,the genetic type of selenium-rich area in Xining-Ledu can be comfirmed.That is ,selenium-rich volcanic rocks on Mountain Laji represent very great concentrationSin Xining group of the Tertiary by complex migration process in the period ofS saltlake shrinking ,Finally ,developed in to soil on these strata and became the selenium-rich soil which an be use.